Search results for "plastic"
showing 10 items of 7296 documents
Photochemotherapeutic heterocyclic agents having antiproliferative and antineoplastic activity
2012
The present invention concerns the synthesis of new analogs of angelicins, pyrrolo[3,2-h]quinoline, for the treatment of pathologie having hyperproliferative character including those having neoplastic nature. The treatment is based on the combined action of pyrrolo[3,2-h]quinolines and UV-A light, through a clinical approach defined as PUVA (psoralen-UVA light). The most important feature of these compounds is that they exert their remarkable phototoxicity without any DNA damage, which is the main origin of the side effects of the PUVA therapy
Complicanze associate all'utilizzo dello stent nelle pieloplastiche open. Studio comparativo tra 2 centri.
2009
Polyester microplastic fibers in soil increase nitrogen loss via leaching and decrease plant biomass production and N uptake
2022
Abstract Microplastic contamination, like other global change factors, can induce effects on ecosystem functions and processes, affecting various soil biophysical properties. However, effects of such contaminants on nutrient cycles in agroecosystems are still poorly understood. We here performed two pot experiments to investigate the effect of polyester microplastic fibers (PMFs) on soil physical properties, nitrogen cycle, and plant performance in a maize-based agroecosystem. Moreover, we followed the N loss via leaching in soil contaminated or not with PMFs by simulating heavy rainfall events that mimic a future scenario of climate change. Our results show that soil contaminated with PMFs…
Fracture and fatigue of titanium narrow dental implants: New trends in order to improve the mechanical response
2019
Sixty-four fractured commercially pure titanium (cp-Ti) narrow dental implants (NDIs) with similar macrogeometry and connection designs were studied after different implantation times in humans in order to determine their reliability and to evaluate the causes of the fracture. These NDIs were compared with other similar implants, made with alloyed titanium with 15% Zr and with 12% strained titanium. Original implants were tested under static and fatigue conditions, simulating the tri-axial loads in the mouth by means of a Bionix hydraulic test machine. Fractography was studied using field-emission scanning electron microscopy (FSEM). The results showed that cp-Ti NDI exhibits low strength f…
Solution processes for plastic thin film transistors
2009
Toward Sustainable PLA-Based Multilayer Complexes with Improved Barrier Properties
2019
Poly(lactic acid) or PLA is currently considered as one of the most promising substitutes of conventional plastics, with low environmental impact, especially for food packaging applications. Nevertheless, some drawbacks, such as high permeability to oxygen, are still limiting its industrial applications. The objective of this study was to highly increase the oxygen barrier performance of PLA without compromising its sustainable nature and following the principles of circular economy perspective. Coproducts coming from mill industries, such as wheat gluten proteins (WG), were used to produce PLA-WG-PLA multilayer complexes with improved barrier performance. Different technologies of industri…
Characterization of thin plastic foils for applications in X-ray optics technology
2007
Thin plastic foils are being investigated to build shell optics for X-ray telescopes. Compared to polished glass optics, the advantage is in terms of increased collecting area, light weight and lower cost. Plastic material is also desirable to allow deformation into a complete surface of revolution. We collected plastic materials of common use for industrial applications and also specialty materials developed for the electronic industry. A comparative study was then performed to evaluate the optical quality of the selected plastic films. Surface analysis was carried out with topographic instruments to investigate the microroughness of our samples at different scan lengths. Preliminary resul…
Plastmasas atkritumu pārstrāde Latvijā
2022
Bakalaura darbā “Plastmasas atkritumu pārstrāde Latvijā” tika veikts pētījums, par esošajiem uzņēmumiem Latvijā, kas nodarbojas ar plastmasas atkritumu pārstrādi. Konkrēti tika apskatīti četri uzņēmumi AS “PET Baltija”, SIA “Nordic Plast”, SIA “Grindplast”, SIA "Why Recycle". Uz doto mirkli šie četri uzņēmumi ir lielākie uzņēmumu Latvijā, kas nodarbojas ar plastmasas atkritumu pārstrādi. Tomēr uzņēmumi spēj pārstrādāt tikai četru veidu plastmasu PET, LDPE, HDPE un PP (kas ir tieši plēves). Darbā tika apskatīts, kāda veida plastmasas produktus uzņēmumi saražo. Apskatīta sīkāka informācija par uzņēmumu finansiālo stāvokli pēdējos gados, tādā veidā meklējot skaidrojumu vai uzņēmumi ir spējīgi …
Plastica in mare: biodiversità della plastisfera
2021
La plastica costituisce la componente più abbondante dei rifiuti in ambiente marino. Le plastiche in mare sono colonizzate da biofilm microbici, denominati plastisfera, che possono comprendere patogeni, specie algali tossiche e invasive e, potenzialmente, organismi in grado di biodeteriorare e degradare le plastiche (Zettler et al. 2013). Lo scopo di questo lavoro è studiare e confrontare le comunità microbiche che colonizzano plastiche biodegradabili e non biodegradabili in ambiente marino. Un esperimento di esposizione di film plastici in ambiente marino portuale è stato allestito per studiare la diversità della plastisfera di alcune plastiche biodegradabili (Mater Bi e PLA-acido polilatt…
Odonats del País Valencià: diversitat, factors implicats en la composició de les seues comunitats i respostes als senyals de risc durant la fase d'ou
2017
Libèl·lules i espiadimonis són els noms comuns emprats per a anomenar eixos insectes que tan familiars en resulten i que configuren l’ordre escollit per a la realització d’aquesta tesi doctoral: el dels odonats. D’entre les característiques taxonòmiques que el configuren com a grup, cal destacar dos trets diagnòstics: un de la fase adulta i l’altre de la fase larvària. Un és l’òrgan copulador dels mascles adults, el qual s’ubica en el segon segment abdominal; aquesta característica determina un comportament reproductor exclusiu: durant l’aparellament el mascle doblega l’abdomen per a poder arribar a l’orifici genital de la femella. L’altre tret és la modificació del llavi inferior de les la…